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'Re[2]: Graphical LCDs'
1995\10\30@114544 by BBoles

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Digi-Key has some Optrex graphical LCD modules 240 * 64 pixels with controller
on board.  OP64240N-ND $95.

Rgds, Brian.           spam_OUTbbolesTakeThisOuTspammicrochip.com

______________________________ Reply Separator _________________________________
Subject: Re: Graphical LCDs
Author:  Paul Picot <.....ppicotKILLspamspam@spam@IRUS.RRI.UWO.CA> at Internet_Exchange
Date:    10/30/95 11:24 AM


On Mon, 30 Oct 1995, Mike Goelzer wrote:

>         Parallax app note 5 talks about controlling an Hitachi LCD module.
> The one they use is a character only LCD, though.  Has anyone tried to
> interface a PIC to one of those graphical LCDs (like the ones in graphing
> calculators)?

I've had a look in several of these sorts of calculators, with the aim of
using the LCD for my own purposes.  Unfortunately, they all seem to bury
the LCD controller in the calculator microcontroller.  It would seem the
only way to use these LCDs is to use a similar microcontroller and
program IT.  It looks virtually impossible to use these as off-the-shelf
LCD units... the drive waveforms are decidedly non-trivial.

If anyone has a lead on small bitmap LCD's that aren't outrageous in
price, I'm sure a lot of people on this list would like to hear about them.

One off-the-wall idea is to use these small LCD televisions: they have OK
resolution (starting about 160x120?) and can take a standard serial
bitstream in ... ;-)  You can even do colour if you want to pay a bit more.

-Paul

1995\10\30@145719 by Mike Goelzer

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>Digi-Key has some Optrex graphical LCD modules 240 * 64 pixels with controller
>on board.  OP64240N-ND $95.
>
>Rgds, Brian.           bbolesspamKILLspammicrochip.com
>

Yes, but the original question was what are the issues involved in
controlling these beasts using a PIC.  For example, how do you interface to
them, how many I/O
pins are required, etc.  If anyone has any info on this, I'd be interested
to hear it.

-mike
--
Mike Goelzer
<.....mgoelzerKILLspamspam.....us.net>

1995\10\30@155647 by Paul Picot

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> Digi-Key has some Optrex graphical LCD modules 240 * 64 pixels with controller
> on board.  OP64240N-ND $95.

My (old) catalogue shows them (OP24064) as $145.46.  So the price is a bit
better, but still unreasonable IMHO.  The trade literature says LCD panels
(glass,electrodes,polarizers) are about $1/square inch.  The controller
chips are surely quantity items, and can't be worth more than $2.  Add
another $2 for the board and steel mounting frame.  $10 raw parts cost.
Even counting a factor-of-two at both the manufacturer and distributor,
and throwing in a bit of shipping costs, these modules should cost
less than $50.

-Paul

1995\10\30@170659 by Paul Picot

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On Mon, 30 Oct 1995 EraseMEBBolesspam_OUTspamTakeThisOuTCCMAIL.MICROCHIP.COM wrote:

> Digi-Key has some Optrex graphical LCD modules 240 * 64 pixels with controller
> on board.  OP64240N-ND $95.

Hey! Wait a minute! I just had a second look: the OP24064N-ND (I assume
you just transposed the digits above) seems NOT to come with controller:
it says it requires a HD1830B/MSM6255 controller set.  Sigh.  Add another
$30 or so and some headache.

-Paul

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